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Prepayment and Other Current Assets (Detail) (USD $)
Jun. 30, 2012
Dec. 31, 2011
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Line Items]    
Prepaid AMEX annual fee $ 20,625 $ 18,125
Recoverable VAT 4,166,984 4,776,962
Prepaid insurance 167,765 61,357
Prepayment for purchase of materials 146,809 206,930
Others 4,223 7,841
Prepayments and other current assets $ 4,506,406 $ 5,071,215